<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<div>Normal</div>
<div><b>Bold</b> <span style="font-weight: bold;">Css Bold</span></div>
<div><strong>Strong</strong></div>
<div><big>Big</big></div>
<div><em>强调</em></div>
<div><i>斜体</i></div>
<div>
    <small>小字体</small>
</div>
<div>Page<sub>1</sub></div>
<div>2<sup>3</sup>=8</div>
</body>
</html>